Fig. 1: Location, stratigraphy, and fossils of the Songluo Biota.

a Cryogenian paleogeographic map, from ref. 26. Red rectangle marks area enlarged in panel (b). b Simplified geological map of Shennongjia area showing location of Songluo section (star). c Measured stratigraphic section of Nantuo Formation at Songluo and representative fossils of the Songluo Biota from SBS in lower Nantuo Formation (modified from ref. 32). SC: South China; SNJ: Shennongjia; DST: Doushantuo; SBS: Songluo black shale. Scale bars: 3 mm.